Exxon Mobil Corp. and environmentalists crossed swords Monday over what the oil giant’s liability and civil penalties for alleged pollution at a Baytown, Texas, refinery should be, in a Clean Air Act citizen suit that was recently revived. The Fifth Circuit in May had revived the long-running suit brought by Environment Texas Citizen Lobby Inc. and the Sierra Club, which contended that ExxonMobil should have to pay penalties for environmental law violations stemming from the Baytown refinery’s emissions. The appellate panel found that the Texas federal judge unevenly analyzed the groups’ claims.

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